Programmable low power high-speed current steering logic (LPHCSL) driver and method of use
First Claim
Patent Images
1. An integrated circuit comprising:
- a voltage regulator circuit including a voltage comparator and a native source follower transistor;
a programmable low power high-speed current steering logic (LPHCSL) driver circuit comprising a plurality of selectable output driver legs and a plurality of programmable resistors; and
a common supply voltage coupled to the voltage regulator circuit, the voltage comparator, the native source follower transistor and to the programmable LPHCSL driver circuit.
3 Assignments
0 Petitions
Accused Products
Abstract
An integrated circuit comprising, a voltage regulator circuit and a programmable low power high-speed current steering logic (LPHCSL) driver circuit coupled to a common supply voltage. The voltage regulator circuit includes a native source follower transistor having a negative threshold voltage to provide more headroom for the voltage regulator to operate. The LPHCSL driver circuit includes a plurality of selectable output driver legs and a plurality of programmable resistors. The ability to use a common supply voltage and the ability to select multiple output impedance drivers reduces the die area without increasing the complexity of the integrated circuit.
134 Citations
19 Claims
-
1. An integrated circuit comprising:
-
a voltage regulator circuit including a voltage comparator and a native source follower transistor; a programmable low power high-speed current steering logic (LPHCSL) driver circuit comprising a plurality of selectable output driver legs and a plurality of programmable resistors; and a common supply voltage coupled to the voltage regulator circuit, the voltage comparator, the native source follower transistor and to the programmable LPHCSL driver circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. An integrated circuit comprising:
-
a voltage regulator circuit; a programmable low power high-speed current steering logic (LPHCSL) driver circuit comprising a plurality of selectable output driver legs and a plurality of programmable resistors, the programmable LPHCSL driver circuit including; a plurality of pre-driver circuits, each of the pre-driver circuits having an input coupled to a true input or a complimentary input signal and one or more outputs coupled to a gate of one of each of the plurality of selectable output driver legs, wherein each of the plurality of selectable output driver legs further comprises a plurality of selectable pull-up transistors having a drain coupled to an output of the voltage regulator circuit and a plurality of pull-down transistors have a source coupled to ground; at least two of the plurality of programmable resistors coupled in series between a source of each of the plurality of pull-up transistors and a drain of each of the plurality of pull-down transistors; and an output signal of the integrated circuit coupled between the at least two of the plurality of programmable resistors coupled in series; and a common supply voltage coupled to the voltage regulator circuit and to the programmable LPHCSL driver circuit. - View Dependent Claims (12, 13, 14)
-
-
15. An integrated circuit comprising:
-
a voltage regulator circuit comprising a voltage comparator and a native source follower transistor, wherein the common supply voltage is coupled to the voltage comparator and the native source follower transistor; a programmable low power high-speed current steering logic (LPHCSL) driver circuit comprising a plurality of selectable output driver legs and a plurality of programmable resistors; a common supply voltage coupled to the voltage regulator circuit and to the programmable LPHCSL driver circuit; and a control logic circuit coupled to the programmable LPHCSL driver circuit, the control logic circuit for selecting one or more of the selectable output driver legs and for programming one or more of the plurality of programmable resistors.
-
-
16. A method comprising:
-
providing a selected supply voltage to a voltage regulator circuit and a programmable low power high-speed current steering logic (LPHCSL) driver circuit, wherein the voltage regulator circuit comprises a native source follower transistor; providing a desired reference voltage to the voltage regulator circuit to set an output level for an output signal from the programmable LPHCSL driver circuit; and selecting one or more of a plurality of selectable output driver legs of the programmable LPHCSL driver circuit and programming one or more of a plurality of programmable resistors of the programmable LPHCSL driver circuit to provide an output signal from the programmable LPHCSL driver having a desired impedance across the selected supply voltage. - View Dependent Claims (17, 18, 19)
-
Specification